unused import in setup.py

If a repo doesnt build docs, pyflakes on setup.py emits

setup.py:8: 'setuptools.command.build_py' imported but unused

https://travis-ci.org/coala/coala-quickstart/builds/402290590

This is blocking https://github.com/coala/coala-quickstart/pull/226

Edited by John Vandenberg
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